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PSR J1311-3430: A Heavyweight Neutron Star with a Flyweight Helium Companion

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arxiv 1210.6884 v1 pith:7TN456UI submitted 2012-10-25 astro-ph.HE

Roger W. Romani , Alexei V. Filippenko , Jeffery M. Silverman , S. Bradley Cenko , Jochen Greiner , Arne Rau , Jonathan Elliott , Holger J. Pletsch This is my paper · ORCID
classification astro-ph.HE
keywords companionj1311-3430largelight-curvemsunphotometryaddingadditional
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We have obtained initial spectroscopic observations and additional photometry of the newly discovered Pb=94min gamma-ray black-widow pulsar PSR J1311-3430. The Keck spectra show a He-dominated, nearly H-free photosphere and a large radial-velocity amplitude of 609.5+/-7.5km/s. Simultaneous seven-color GROND photometry further probes the heating of this companion, and shows the presence of a flaring infrared excess. We have modeled the quiescent light curve, constraining the orbital inclination and masses. Simple heated light-curve fits give M_NS=2.7Msun, but show systematic light-curve differences. Adding extra components allows a larger mass range to be fit, but all viable solutions have M_NS>2.1Msun. If confirmed, such a large M_NS substantially constrains the equation of state of matter at supernuclear densities.

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